Mooring derrick-scows in raft construction.



UNITED STATES atented September Si, 1903. A Y

PATENT OFFICE.

JoHNAYRE's, OEVPORTLAND, OREGON, Assia-NOR To OREGON RAFTING OOMPANY,.OE PORTLAND, OREGON, A CORPORATION OF OREGON.

`MOO'RING DERRlCK-'SCOWS IN RAFT CONSTRUCTION.

SPECIFICATION' forming part of Letters Patent No. 738,595, dated September 8, 1903.

Application led September 25, 1902. Serial No. 124,822. (No model.)

My invention relates to devices and appa-- ratus used in the construction of rafts composed of logs, timber, planks, or other forms of lumber, which said rafts are built at points of available supply of the logs, dac., and are intended to be towed on the water-generally a long voyage on the ocean-to their destination, where they are to be broken up and their lumber sold. In the construction of these rafts there is what is called a cradle, which Yis a framework of proper shape and to which the logs, dac., to compose the raft are supplied and Within which the raft is built up. The logs are floated to a waterway just outside the cradle, and in this waterway is a scow with a derrick upon it, the function of which is to lift the logs from the waterway and to deposit them `in proper position in the cradle in the then progressing raft construction. The

raft when built is very large, and the cradle is therefore an extensive structure. This requires the frequent moving and mooring of the derrick-scow fo place it in dierent positions, according to the progress of the raft construction, in Order to supply the logs at the proper points. The difficulty of thus moving and mooring the derrick-scow and the time lost in the operation have been the inotives of my invention, the object of which is to provide an apparatus of simple character which will enable the derrick-scow to be moved and moored with accuracy and facility; and to this end my invention consists in the novel apparatus which I shall now de* scribe by reference to the accompanying drawings, in which-A Figure l is a plan view of my apparatus. Fig. 2 is a side elevation of same.

A represents in a general way one Wall of the cradle in which the raft is to be built.

This cradle need not be described in detail, as it may be of any suitable construction. It will b'e sufficient for the present understanding to say that its walls are composed, essentially, of piles, as here indicated.

B is the waterway outside of the cradlewall, and C is a boom of logs'fioating in the water and lying against the piles of the cradle-wall, said boom serving as a guard-rail, as it were, for the derrick-scow D, which floats in the Waterway and is adapted to move along the whole length of the boom C and cradle-Wall A.

E is the outer boom to form the waterway B.`

F is a fixed cable. ends of the cradle A in any suitable manner. I have here shown its after end secured to a dolphin or cluster of piles G and its forward end secured to a brace a of the cradlepiles. In its intervening length the cable F hangs down upon the boom C, except Where it is picked up by the scow, as I shall explain. The scow D carries a derrick d, and it has also a gipsy or windlass d, adapted to be driven bya suitable engine,(indicated at d2.) The cable F passes up to the scow and takes several turns around the gipsy d.

II indicates the logs in the waterway B and which are to be picked up by the derrick and lifted over into the cradle. By the connection of the scow with the fixed cable F said scow is properly moored, and by operating the gipsy d the scow can be moved in either direction by winding itself along the cable to any desired position along the wall of the cradle A, and wherever it st-Ops it is again suitably moored. This operation can be done with accuracy and facility, thus saving much time and labor.

Having thus-described my invention, what I claim as new, and desire to secure by Letters Patent, is

In combination with a cradle of the character described having a curved outline, a boom spaced therefrom to form a waterway therebetween for logs, a scow arranged to traverse said waterway, a derrick carried by said scow mounted to swing from the waterway over into the cradle, and means for pro- This is secured at the i pelling the scoW to shift the derriek longitu- In Witness whereof I have hereunto set my (linally of the cradle, said means including a hand. fixed draft-cable secured at its ends adjacent to the points of juncture of the Curved sides JOHN AYRES 5 of the cradle and with its intermediate p0r- Witnesses:

tion following approximately the curvature G. B. MCLEOD,

of the side line ofthe cradle. WALTER F. VANE. 

